Three-phase balanced circuit breaker

The utility model discloses a three-phase balanced circuit breaker, which relates to the technical field of circuit breakers and comprises a three-phase circuit breaker main body and a trip switch, the three-phase circuit breaker main body comprises a wire interface, and a knob is arranged on the outer wall of the top of the three-phase circuit breaker main body. When an electric wire is inserted into an electric wire interface to be installed, the rotary knob is rotated to drive the positive and negative threaded rod to rotate, so that the upper and lower moving plates move towards the outer side, one end of the movable rod is driven to move towards the two sides, the electric wire fixing plate moves inwards, the electric wire is fixed, and then the electric wire is fixed by rotating the fixing screw. The problems that when a null line and a live line are installed on an existing three-phase circuit breaker, a wire is prone to shaking after being touched carelessly, the wire needs to be held by one hand, the